US3792721A - Pressure accumulator - Google Patents

Pressure accumulator Download PDF

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Publication number
US3792721A
US3792721A US00276147A US3792721DA US3792721A US 3792721 A US3792721 A US 3792721A US 00276147 A US00276147 A US 00276147A US 3792721D A US3792721D A US 3792721DA US 3792721 A US3792721 A US 3792721A
Authority
US
United States
Prior art keywords
bladder
valve member
diameter portion
reduced diameter
flange
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00276147A
Other languages
English (en)
Inventor
A Zahid
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GREE HYDRAULICS OF CALIFORNIA Inc
S-P MANUFACTURING Corp A CORP OF OHIO
Original Assignee
Greer Hydraulics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Greer Hydraulics Inc filed Critical Greer Hydraulics Inc
Application granted granted Critical
Publication of US3792721A publication Critical patent/US3792721A/en
Assigned to GREE HYDRAULICS OF CALIFORNIA, INC. reassignment GREE HYDRAULICS OF CALIFORNIA, INC. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: GREER HYDRAULICS, INCORPORATED, GREER HYDRAULICS OF CALIFORNIA, INC.
Assigned to VSI CORPORATION reassignment VSI CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE 12-16-81 Assignors: GREER HYDRAULICS, INCORPORATED
Assigned to FIGGIE INTERNATIONAL INC., A CORP. OF DE reassignment FIGGIE INTERNATIONAL INC., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: VSI CORPORATION
Assigned to S-P MANUFACTURING CORPORATION, THE, A CORP. OF OHIO reassignment S-P MANUFACTURING CORPORATION, THE, A CORP. OF OHIO ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FIGGIE INTERNATIONAL INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/22—Liquid port constructions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • F15B1/12—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means attached at their periphery
    • F15B1/14—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means attached at their periphery by means of a rigid annular supporting member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/04—Devices damping pulsations or vibrations in fluids
    • F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
    • F16L55/05—Buffers therefor
    • F16L55/052—Pneumatic reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3152—Accumulator separating means having flexible separating means the flexible separating means being bladders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3156—Accumulator separating means having flexible separating means characterised by their attachment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • F15B2201/411—Liquid ports having valve means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/415—Gas ports
    • F15B2201/4155—Gas ports having valve means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/43—Anti-extrusion means
    • F15B2201/435—Anti-extrusion means being fixed to the separating means

Definitions

  • This invention relates to the art of pressure vessels, more particularly of the type having a rigid container with a deformable bladder therein dividing the container into two variable volume chambers, each adapted to receive fluid under pressure.
  • a port is in communication with one of said chambers and a valve member mounted axially on the bladder and molded integrally therewith is associated with said port to close the latter.
  • the valve member is molded into the bladder in such manner that the force exerted by the compressed gas in the bladder will exert a minimum of shearing stress against the molded junction of the valve member to the associated end of the bladder to prevent shearing.
  • the valve member has a portion extending axially behond the molded junction thereby eliminating impact against such molded junction when the valve member seats to close the port.
  • valve member is in the form of a button molded at the free end of a bladder which has its opposed end securely mounted to the container, it is essential that the valve member not be subjected to shearing action due to the force exerted by the compressed gas in the bladder, particularly against the bonded junction of the valve member to the bladder. If such shearing action occurs, there will be a tendency for the bladder material to separate from the valve member or button with resultant tearing of the bladder and failure of the unit.
  • valve member or button will strike against the valve seat defined by the periphery of the oil port to close the latter and as such operation happens many times during cycling of the accumulator in use, where the bonded area is subjected to such constant impacts, it is likely to fail with resultant failure of the unit.
  • valve member or button may readily be molded integrally with the bladder with assurance that the molded junction between the periphery of the valve member and the bladder will not be subjected to shearing stress and furthermore, with assurance that when the bladder seats to close the oil port, the impact of such closing action against the molded junction of the bladder to the valve member will be substantially minimized.
  • FIG. 1 is a perspective view of a pressure vessel according to the invention
  • FIG. 2 is a sectional view on a greatly enlarged scale with parts broken away taken along line 2--2 of FIG. 1, and i I
  • FIG. 3 is a sectional view on a further enlarged scale showing the valve member and associated port.
  • the pressure vessel illustratively comprises a substantially cylindrical container 1 l of rigid material such as steel or aluminum capable of withstanding the pressure to which it is to be subjected in use.
  • the container has one end closed as at 12 and such closed end has an axial port 13, the inner end 14 of which defines a valve seat.
  • the mouth 15 of the container is cylindrical as shown and the inner surface of the container adjacent the mouth 15 is threaded as at 16.
  • An annular groove 17 is provided in the inner surface of the container adjacent the inner end of the threaded portion 16 and such annular groove 17 is in communication with the exterior of the unit through transverse passageway 18.
  • the inner diameter of the container is of lesser diameter than the diameter of the threaded portion 16 as is clearly shown at 19 and the annular portion of the inner surface of the container from the reduced diameter portion 19 to the annular groove 17 is beveled outwardly as at 21 to define an annular clearance 22.
  • a deformable partition illustratively in the form of an elongated bladder 23 of rubber or similar material having like characteristics, which dividesthe container 11 into two chambers C and C-1.
  • the bladder 23 is closed at one end as at 24 and the mouth 25 of the bladder which is of greater thickness than the remaining portion of the bladder is secured as by molding to an annular supporting member 26 of rigid material, preferably of steel. By reason of the molding of the bladder 23 to the annular supporting member 26, the bladder 23 will be securely bonded to such supporting member 26.
  • the annular supporting member 26 is substantially rectangular in cross section, illustratively having a flat top wall 27 and a depending annular flange 28 with an outwardly extending lip 29 integral with its flat inner surface 31.
  • the transverse width of the annular supporting member is greater than that of the thickened rim 25 of the bladder so that as clearly shown in FIG. 2, the outer periphery 32 of the annular supporting member 26 will extend laterally outwardly of the outer periphery 33 of the thickened rim 25.
  • the inner diameter of the container is still further reduced to define an annular shoulder 34 which forms a seat for the outer periphery 32 of the annular supporting member 26 so that the bladder 23 will be dependablyretained in desired position in the container.
  • the annular supporting member 26 has an annular groove 35 in its outer periphery in which an O-ring 36 is positioned, the function of the O-ring being to provide a seal.
  • a cylindrical cover member 38 is provided in order to retain the annular supporting member 26 and bladder 23 in position.
  • the cover member is substantially cup-shaped with its side wall or skirt 39 of outer diameter just slightly less than the diameter of the reduced portion 19 of the container so that the side wall 39 may readily be positioned in the container.
  • the cover member 38 adjacent its outer surface is of slightly enlarged diameter as at 41 and is externally threaded so that the cover member may be screwed into threaded mouth 16 of the container by means of a spanner wrench (not shown) applied to conventional bores 42' in the top surface 42 of the cover member 38.
  • the cover member when the cover member is screwed into the container so that the top surface 42 of the cover member is flush with the outer end 15 of the container, the inner end 43 of the side wall 39 of the cover member will abut against the top surface 27 of the annular supporting member 26 to retain the latter on the annular shoulder 34.
  • the outer periphery of the side wall 39 of the cover member has an annular groove 44 in which an O-ring 45 is positioned to define a seal between the side wall 39 and the inner surface of the container.
  • the cover member has an axial bore 51 in which a conventional gas charging valve 52 may be positioned, the latter having a removable cap 53 associated therewith to protect the charging valve 52.
  • valve member 54 illustratively in the form of a button, preferably formed from steel or aluminum.
  • the valve member illustratively is in the form of a disc having a top portion 55 with a rounded periphery 55' and has a reduced diameter portion 56 defining a cylindrical side wall 57, the outer periphery of the top portion 55 of the valve member extending laterally outward beyond the side wall 57 to define an annular flange 58.
  • valve member 54 has a further reduced diameter portion 61 defining a second cylindrical side wall 62 and an annular shoulder 63.
  • the surface 68 of reduced diameter portion 61 defines the abutment surface of the valve member, the latter having a plurality of diametric grooves 71, the function of which will be hereinafter described.
  • the valve member 54 is molded integrally with the end 24 of the bladder so as to be axially aligned therewith.
  • a layer 65 of bladder material will extend across the top surface 66 of the valve member.
  • the cylindrical side 3 wall 57 of the valve member as well as the top surface 66 and the rounded periphery 55 and the undersurface of flange 58 are coated with a bonding agent prior to molding and the bladder material is bonded to said side wall 57 as well as to the bottom surface, rounded periphery and top surfaces of the flange 58.
  • the outer surface of the portion 67 of the bladder is aligned with the shoulder 63 so that the cylindrical portion 62 of the valve member will protrude axially outwardly from the end of the bladder.
  • the bladder 23 may be precharged with gas under pressure through valve 52.
  • the bladder will expand and the periphery 68 of the undersurface of the valve member will move against the seat S defined by the periphery of the port 13 to close said port.
  • a fluid such as liquid under pressure is forced into chamber C-l through a valve (not shown) controlling port 13, to compress the gas in chamber C.
  • annular contact region defined by the periphery 68 of the undersurface of the valve member extends axially beyond the bonded junction of the bladder to the cylindrical wall 57. Consequently, during operation, onlythe rigid metal undersurface of the valve member will be subjected to impact when it strikes the seat S defined by the periphery of port 13. As a result, no direct impact will be imparted to the bonded junction at 57 which could cause a crack to start which would quickly extend through the entire thickness of the bladder wall causing failure of the bladder.
  • valve member will remain securely bonded to the end of the bladder without likelihood of breakage of the bond, even after long repeated use of the pressure accumulator.
  • a pressure vessel comprising a container of rigid material having two ports, one of said ports being axially aligned with said container and defining a liquid port, a deformable bladder secured in said container and separating said two ports from each other to define two variable volume fluid receiving chambers, one of said chambers being in communication with said liquid port, said bladder extending axially in said container and being closed at one end, means to charge said bladder with gas under pressure through the other of said ports, the portion of the container adjacent the periphery of the liquid port defining a valve seat, a valve member molded in the closed end of said bladder and axially aligned therewith adapted to move against said valve seat to close said liquid port, said valve member comprising a disc having an abutment surface adapted to engage said valve seat and having a reduced diameter portion extending axially outward therefrom defin ing a laterally extending annular flange of greater diameter than the abutment surface of said disc, said reduced diameter portion having a side wall to which the bladder material is
  • a bladder for a pressure vessel said bladder being of deformable material and having an opening at one end and being closed at its other end, said closed end being axially aligned with said opening, a valve member molded in the closed end of said bladder and axially aligned therewith, said valve member comprising a disc having a reduced diameter portion extending axially outward therefrom defining a laterally extending annular flange, said reduced diameter portion having a side wall to which the bladder material is bonded, said valve member having a further reduced diameter portion extending axially outward from said first reduced diameter portion and defining an abutment surface, said annular flange of the disc being of greater diameter than said abutment surface, said flange being interposed between the interior of said bladder and the bonded junction of the bladder material to said side wall.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Bag Frames (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
US00276147A 1972-07-28 1972-07-28 Pressure accumulator Expired - Lifetime US3792721A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US27614772A 1972-07-28 1972-07-28

Publications (1)

Publication Number Publication Date
US3792721A true US3792721A (en) 1974-02-19

Family

ID=23055387

Family Applications (1)

Application Number Title Priority Date Filing Date
US00276147A Expired - Lifetime US3792721A (en) 1972-07-28 1972-07-28 Pressure accumulator

Country Status (10)

Country Link
US (1) US3792721A (nl)
JP (2) JPS5426723B2 (nl)
AR (1) AR197152A1 (nl)
BR (1) BR7305551D0 (nl)
CA (1) CA984702A (nl)
CS (1) CS169844B2 (nl)
IL (1) IL42477A (nl)
IN (1) IN142007B (nl)
PL (1) PL96791B1 (nl)
SU (1) SU673197A3 (nl)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4058320A (en) * 1976-07-26 1977-11-15 Westinghouse Electric Corporation Generator seal oil supply system
US4173988A (en) * 1977-04-29 1979-11-13 Weatherford/Lamb Inc. Pneumatically actuated thread protector for pipes
US5027859A (en) * 1988-09-03 1991-07-02 Nobuyuki Sugimura Apparatus for supporting diaphragm of accumulator
US5536028A (en) * 1994-09-28 1996-07-16 Howard; Durrell U. Power centering compensator for vehicle steering systems
FR2796673A1 (fr) * 1999-07-21 2001-01-26 Caoutchouc Tech S A C A T E C Bouton pour vessie d'accumulateur hydraulique et dispositif de moulage pour le moulage d'une vessie a bouton
US6267395B1 (en) 1999-10-18 2001-07-31 Durrell U. Howard Vehicle steering compensator with air actuated trim mechanism
US6530585B1 (en) 2001-11-16 2003-03-11 Durrell U Howard Vehicle steering stabilizer with detent ramp in rotary plate
US6817620B1 (en) 2002-08-02 2004-11-16 Durrell U Howard Precision steer wheel control system with internal solenoid
US20050167939A1 (en) * 2002-08-02 2005-08-04 Howard Durrell U. Precision steer wheel control system with remote trim valve assembly
US7118118B1 (en) 2004-06-18 2006-10-10 Howard Durrell U Steer wheel control system with dual pistons connected to a common shaft
US7219908B1 (en) 2005-10-28 2007-05-22 Howard Durrell U Steer wheel control system with stationary piston and reciprocating cylinder
US7806419B1 (en) 2005-10-28 2010-10-05 Howard Durrell U Steer wheel control system with reciprocating cylinder

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5254911U (nl) * 1975-10-20 1977-04-20

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2604118A (en) * 1946-04-25 1952-07-22 Greer Hydraulics Inc Hydraulic accumulator
US2880759A (en) * 1956-06-06 1959-04-07 Bendix Aviat Corp Hydro-pneumatic energy storage device
US2893433A (en) * 1956-06-06 1959-07-07 Bendix Aviat Corp Hydro-pneumatic energy storage device
US3211348A (en) * 1964-05-21 1965-10-12 Greer Hydraulics Inc Pressure vessels
US3220594A (en) * 1960-11-30 1965-11-30 Langen & Co Pressure vessel

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4841689U (nl) * 1971-09-18 1973-05-28

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2604118A (en) * 1946-04-25 1952-07-22 Greer Hydraulics Inc Hydraulic accumulator
US2880759A (en) * 1956-06-06 1959-04-07 Bendix Aviat Corp Hydro-pneumatic energy storage device
US2893433A (en) * 1956-06-06 1959-07-07 Bendix Aviat Corp Hydro-pneumatic energy storage device
US3220594A (en) * 1960-11-30 1965-11-30 Langen & Co Pressure vessel
US3211348A (en) * 1964-05-21 1965-10-12 Greer Hydraulics Inc Pressure vessels

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4058320A (en) * 1976-07-26 1977-11-15 Westinghouse Electric Corporation Generator seal oil supply system
US4173988A (en) * 1977-04-29 1979-11-13 Weatherford/Lamb Inc. Pneumatically actuated thread protector for pipes
US5027859A (en) * 1988-09-03 1991-07-02 Nobuyuki Sugimura Apparatus for supporting diaphragm of accumulator
US5536028A (en) * 1994-09-28 1996-07-16 Howard; Durrell U. Power centering compensator for vehicle steering systems
FR2796673A1 (fr) * 1999-07-21 2001-01-26 Caoutchouc Tech S A C A T E C Bouton pour vessie d'accumulateur hydraulique et dispositif de moulage pour le moulage d'une vessie a bouton
US6267395B1 (en) 1999-10-18 2001-07-31 Durrell U. Howard Vehicle steering compensator with air actuated trim mechanism
US6530585B1 (en) 2001-11-16 2003-03-11 Durrell U Howard Vehicle steering stabilizer with detent ramp in rotary plate
US20040056443A1 (en) * 2001-11-16 2004-03-25 Howard Durrell U. Steer wheel control system with trimmable rotary plate
US6994361B2 (en) 2001-11-16 2006-02-07 Durrell U Howard Steer wheel control system with trimmable rotary plate
US6817620B1 (en) 2002-08-02 2004-11-16 Durrell U Howard Precision steer wheel control system with internal solenoid
US20050167939A1 (en) * 2002-08-02 2005-08-04 Howard Durrell U. Precision steer wheel control system with remote trim valve assembly
US7207580B2 (en) 2002-08-02 2007-04-24 Howard Durrell U Precision steer wheel control system with remote trim valve assembly
US7118118B1 (en) 2004-06-18 2006-10-10 Howard Durrell U Steer wheel control system with dual pistons connected to a common shaft
US7219908B1 (en) 2005-10-28 2007-05-22 Howard Durrell U Steer wheel control system with stationary piston and reciprocating cylinder
US7806419B1 (en) 2005-10-28 2010-10-05 Howard Durrell U Steer wheel control system with reciprocating cylinder

Also Published As

Publication number Publication date
PL96791B1 (pl) 1978-01-31
JPS4958416A (nl) 1974-06-06
BR7305551D0 (pt) 1974-09-05
JPS5118312A (en) 1976-02-13
JPS5426723B2 (nl) 1979-09-05
AR197152A1 (es) 1974-03-15
SU673197A3 (ru) 1979-07-05
IN142007B (nl) 1977-05-21
IL42477A0 (en) 1973-08-29
CS169844B2 (nl) 1976-07-29
CA984702A (en) 1976-03-02
IL42477A (en) 1976-02-29

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Legal Events

Date Code Title Description
AS Assignment

Owner name: GREE HYDRAULICS OF CALIFORNIA, INC., A CORP. OF CA

Free format text: MERGER;ASSIGNOR:GREER HYDRAULICS, INCORPORATED, GREER HYDRAULICS OF CALIFORNIA, INC.;REEL/FRAME:004014/0964

Effective date: 19811218

AS Assignment

Owner name: VSI CORPORATION

Free format text: MERGER;ASSIGNOR:GREER HYDRAULICS, INCORPORATED;REEL/FRAME:004013/0645

Effective date: 19820204

AS Assignment

Owner name: FIGGIE INTERNATIONAL INC., A CORP. OF DE,VIRGINIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:VSI CORPORATION;REEL/FRAME:004822/0665

Effective date: 19871218

Owner name: FIGGIE INTERNATIONAL INC., 1000 VIRGINIA CENTER PA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:VSI CORPORATION;REEL/FRAME:004822/0665

Effective date: 19871218

AS Assignment

Owner name: S-P MANUFACTURING CORPORATION, THE, A CORP. OF OHI

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:FIGGIE INTERNATIONAL INC.;REEL/FRAME:005017/0972

Effective date: 19890106